Why does my pointer move slowly BY ITSELF sometimes?

I have and use spyware, adware, virus protection and scan frequently and fix problems.

Why does my pointer move slowly BY ITSELF sometimes?computer virus

Yes, if it's an optical mouse, this is a fairly common occurrence (depending on what kind of surface the mouse is on). Sometimes the camera gets stuck in a sort of loop that makes the mouse think it's still moving when it's not. This happens to me sometimes. If it really bothers you, try getting a mousepad designed for optical mice.

Why does my pointer move slowly BY ITSELF sometimes?free spyware remover

Mine does it too sometimes, I'm pretty sure it has nothing to do with viruses or anything like that. I think it maybe the surface the mouse is on is tremoring or something and the mouse is sensitive to that. Or maybe it's on a very slight slant and the mouse starts sliding.
I wish I had a definitive answer. I have two different wireless optical mice, had the same problem with both across different laptops, and the problem survived a reinstall of Win2k pro.

Finally resolved when I got a new laptop with XP Pro. Additional data point: my wife uses same model of mouse, has always had XP and never had the problem.
If you have an optical mouse(the kind with the red light) its may just be a harmless malfunction. Unless it is more than just a small movement, even then i doubt it is cause be a virus or simialar problem.